Improvements let-off mechanisms for looms



J. M. LINSGUTT.

Let-01T Mechanisms for Looms.

Patented Apcil 28,1874.

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UNITED STATES PATENT Error.

JOHN M. LINSCO'IT, OF BUXTON, MAINE.

IMPROVEMENT IN LET-OFF MECHANISMS FOR LOOMS.

Specification forming part of Letters Patent No. 150,168, dated April 28, 1874; application led March 20, 1874.

To all whom it may concern:

Be it known that I, JOHN M. LINsooTT, of Buxton, in the county of York and State of Maine, have invented certain new and useful Improvements in Loom Let-Off Mechanism; and I do hereby declare that the following is a full, clear, and exact description thereof, that will enable others skilled. in the art to which it appertains to make and use the same, reference Vbeing had to the accompanying drawings and the letters of reference marked thereon, which form a part of this specification.

Figure 1 is a side view of my invention. Fig. 2 is a vertical transverse section on the line w, Fig. 1, parts broken away. Fig. 3 is a top plan view, parts broken away. Fig. 4 is a view in detail enlarged.

Same letters show like parts.

The object of my invention is to improve upon certain devices for which Letters Patent of the United States were granted me August 12, 1873, No. 141,720. My invention relates to certain devices for regulating the delivery of the yarn from the yarn-beam of a loom, so that an even tension is produced throughout the entire delivery. Its construction may be thus described:

a shows the frame of the machine; b, the yarnbeam, which has bearings c in the frame a. This yarn-beam is provided with the rolls or trucks d, around which pass the friction-bands e, the inner ends of which are attached to the cross-piece f of the frame of the machine-the outer ends to the levers g. These levers pass through blocks h, which are pivoted to the adjustable clamp z', and are held in place by means of set-screwsj, or other equivalent devices. They have pivoted to their inner ends the additional or supplemental levers 7c. To the cross-piecej' of the machine-frame is fastened a spring, l, the inner end of which is attached to the inner ends of the supplemental levers 7c by means of the links m. The outer end of this spring bears up against a socketed horizontal bar or lever, n, which slides up and down on a vertical bar, o. This vertical bar is also attached to the cross-piecef. The inner end p of the lever a bears up against the under side of the yarn-beam, as shown in the drawing.

Having thus given and described the cona struction of my invention, I will now describe its method of operating.

Supposing the yarn-beam b to be well filled with yarn, it is evident that a larger amount of friction is required to regulate the delivery of the same when so filled than when nearly empty, for the reason that the amount of leverage obtained in delivering from a filled yarn-beam is greater than that obtained when the yarn-beam is nearly empty. Now, if the yarn-beam b is lled with yarn, the levern will be well down on the vertical bar or rod o, and be pressed up against the yarn on said beam by reason of the spring l bearing or pushing up against the lower side of the lever a. With the spring thus contracted it is evident that the friction on the rolls will be great, and as the yarn is delivered from the beam the spring causes the lever, as before described, to keep pressed up against the yarn thereon. While the yarn is being thus delivered, and -the lever following up under the same, the friction on the rolls (l will be constantly diminishing, thus producing an even tension throughout the entire delivery of the yarn.

When it is desired to remove all friction from the rolls or trucks d, all that is necessary to do is to slide the links q, which connect the outer ends of the supplemental levers to the levers g, outwardly or away from the ends of said supplementallevers. Thismovementfrees the connection of the said levers at that point and they drop down to a position in which the friction-bands are slackened, and all friction removed from the rolls or trucks d.

Thepurpose of the adjustable clamps is to regulate the amount of leverage to be derived from the levers. For instance, suppose the clamps i to be in the position shown in Fig. 1, and it is desired to obtain a shorter leverage, the screw-nuts r on the bolts s should be loosened, the set-screws jin the block h should also be loosened, and the clamps be slid along toward the links m to the point desired. The screw-nuts are then tightened, the set-screws screwed in against the levers g, and the required leverage is obtained.

The improvements in this device over that already secured to me by Letters Patent of the United States, as recited at the commencement of this specification, consist in the arrangement of the spring Z, the vertical and horizontal levers n o, and the adjustable clamps i, for regulating the amount of leverage to be derived from the levers g k.

This improvement also differs from the one above mentioned, inasmuch as the pivotal point on the levers is inside the point of attachment of said levers to the friction-bands, and the spring l draws upward instead of downward on the ends of the supplemental levers 7s.

What I claim as my invention, and desire to secure by Letters Patent, is-

The combination, With the yarn-beam b and rolls d, of the friction-bands e, levers g k, ad j u stable clamps z', 'set-screws j, links on q, ,spring l, vertical bar o,and socketed horizontallever n, the whole arranged to operate substan tially in the manner herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 9th day of March, 1874:.

JOHN M. LINSCOTT. 

